Method of producing stereotype printing-plates.



A. L. CASE. METHOD OF PRODUCING STEREOTYPE PRINTING PLATES. AIYLIOATIONFILED DEG.27,1907.

Patented June 10, 19 13.

/ INVENTIOR Arthur .L Case- Fig: 6

ATTORNEY ARTHUR L. CASE, OF PLAINFIELD, NEW JERSEY.

METHOD OF PRODUCING STEREOTYPE PRINTING-PLATES.

aura-one.

Specification of Letters Patent.

:rt'cintcd June 10. I913.

itpptieatton filed December 27, 1907. Serial No. 408,282.

Be it ltnown that l. Airmen L. (lxsa, a citizen of the l mited States ofAmerica. and a resident of Plaintiiiltl, Union county. New Jersey, haveinvented certain new and useful improvements in Methods of ProducingStereotype Printing-Plates,of \vhioh the following is a specification;

The present invention relatcsto stereotype printing plates and to themethod of produeing the same.

In the prior art; of stereotyping it has been customaryto cast the platein an open or non iincloscd casting chamber, thereby pro- (lacing aplate having considerable overcast. This plate has to be trimmed and thesurplus metal removed.

The object of this invention is to obviate the necessity of trimming theplate after it is cast. This is elleet'ed by originally casting theplate to its required length and devoid of overcast.

In the accompanying drawings is shown a preferred form of an apparl'itusfor carrying out the invention. This apparatus is not claimed hereinlmtfor ns the subject matter of an application tiled by me on the l-t-thof March 1907 Serial No. 362,343.

In the said drawings: l igure l is a side view in elevation, partlybroken away and in section, of a stereotype casting machine for carryingout the invcnt'ion. Fig. is a detail view partly in section of one ofthe head gages. Fig. 3 is a perspective view of the valve for regulatingthe admission of metal to the casting chamber. Fig. t is a perspectiveview of toy improved stereotypc printing plate. Fig. 5 is a transversescctional view through the cope and drag on the line 5---5 ol Fig. 1.Fig. (3 is a sectional view on the line 6 6 of Fig. .2.

Similar characters of rct'crence indicate corresponding parts in thedill'crcnt views.

' 1 indicates a metal Inciting furnace of any usual or suitablestructure and provided with the melting pot 2. Located adjacent to thismetal melting furnace is in this instance an upright stereotype castingmold. indicated by it. The casting mold is composed of two parts, astationary part. hcrc called the drag and indicated by l. and a movablepart, here eallcd the copc, indicated by 5. The stationary part canconvhnicntly be placed with the back against the metal melting furnaceand is secured thcrclo by any suitable means, as the bolts (i. The meansfor moving the cope toward and away from the drug may be of any suitableconstruction. lo the present instance. the ccpe is hinged at its lowerend by mcans of the pivot 7 and maybe provided with the operating handle3.

The casting chamber 9 is substantially of the contour and dimensions ofthe plate to be cast being incloscd by the cope and drag, by two sidegages 9 and by the lower and upper head gages indicated respectively by10 and ll, the said head gages being beveled in opposite directions asshown.

Suitable means of connnunication from the pot to the casting chamber areprovided. The particular form here followed consists of a duct 12leading from the pot and extending downwardly within the metal meltingfurnace, and outwardly to the exterior thereof where it communicateswith a borizontal passage 13 in the lower end of the drag which l-adsinto the casting chamber. This passage 13 is snrroumled by an air space14 which separates it from or renders it free from contact with theusuahwater back l5. so that the water in the latter will not tend tocool the metal before it enters the casting chamber. ll desired, someauxiliary heating means. as the gas jets 16 may be utilized to heat thepassagc t3.

17. indicates a valve for regulating the admission of the molten metalinto the casting chamber. This valve consists of two plates to ol sheetmetal. between which is interposed a body ot asbcstos'or the like. It isnormally held in its closed position by means of the spring 15) and isopcncd by means of the lever 20 and connections 21 and 22.

shown.

2:3 for allowing the air to csca )e as the casting chamber is tilted.This valve is providcd with a slbt Q-l in which plays a snit able stop25 cal ricd by the. gage so that the valve by its own weight is normally0 en. The rise-of the molten metal serves to c ose the valve in its sealit; by reason of the complemcntary tapcred surfaces in the valve andseat, and when so closed it forms a part oi the wall of the castingchamber, the said valve being bevclcd to correspond to the bevel ol. thegage. A signal or iiulicator 97 an convcnicnlly bc;carricd by this valvel the mold when the latter is full.

Located in the u )er hcad age is a valve and will be caus d to rise orproject outside \Vhcn this valve is closed itv forms a part of the wallof the casting chamber as The plate shown in Fig. 4 is the-product ofthe lnethod employed in originally cast ing the plate to its requiredlength. The said plate 50 is characterized by the fact that it isoriginally devoid of overcast and is originally surfaces 51 at its upperand lower ends. What is claimed is:

1. The method of producinga stereotype printing plate or other articlewhich is initially devoid of overcast,- consisti'ng in {lowing moltenmetal into a casting chamber of the proper-size and contour-of the plateto be cast, allowing the air to escape from the casting chamber as it isdisplaced by the metal entering the chamber, 'and finally, when thecasting chamber is completely filled with molten metal, closinga'nd'sealing oil the castinglchamber both at the point of entrance ofmetal and the point of exit of an. 4 v

Ihe method o producing 'a stereotype printing plate initially devoid ofovercast, Wll'lClLCOllSlStS in flowing by gravity molten metal into acasting chamber of tbecproper size and contour ot the plate to be cast,al-- lowing the air to escape from the casting chamber as it s displacedby the metal entering the chamber, and

formed with oppositely beveled.

casting chamber is completely filled with molten metal, closing andcasting chamber both at the point trance of metaland the point of exitotair,

3. The process of producing a stereotype rintin )late ori inall free ofovercast a: a: a

which consists in flowing molten metal into the lower end of asubstantially upright casting chamber, permitting the air to escape fromthe upper portion of the as it is displaced by the. entering moltenmetal, closing of? the air outlet as'the chamber becomes completelyfilled with metal, and, after the chamber has been completely filledwith metal-,rlosing oil the inlet in the bottom portion of the chamberat the point 4 of entry into the chamber,

molten metal completely filling a closed easting chamber of the requiredproduce perfect printing overcast.

Signed at New York citythis Qtth day of December, 1907.

ARTHUR L. CASE.

Witnesses:

Anna V. BEEKEB. Geo. A0 Manet-1min.

finally, when the.

whereby the i dimensions, will plate devoid of sealing oft the ofenchamber

